Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_JUMP_LABEL_H
|
|
#define _ASM_X86_JUMP_LABEL_H
|
|
|
|
#define HAVE_JUMP_LABEL_BATCH
|
|
|
|
#include <asm/asm.h>
|
|
#include <asm/nops.h>
|
|
|
|
#ifndef __ASSEMBLER__
|
|
|
|
#include <linux/stringify.h>
|
|
#include <linux/types.h>
|
|
|
|
#define JUMP_TABLE_ENTRY(key, label) \
|
|
".pushsection __jump_table, \"aw\" \n\t" \
|
|
_ASM_ALIGN "\n\t" \
|
|
ANNOTATE_DATA_SPECIAL "\n" \
|
|
".long 1b - . \n\t" \
|
|
".long " label " - . \n\t" \
|
|
_ASM_PTR " " key " - . \n\t" \
|
|
".popsection \n\t"
|
|
|
|
/* This macro is also expanded on the Rust side. */
|
|
#ifdef CONFIG_HAVE_JUMP_LABEL_HACK
|
|
#define ARCH_STATIC_BRANCH_ASM(key, label) \
|
|
"1: jmp " label " # objtool NOPs this \n\t" \
|
|
JUMP_TABLE_ENTRY(key " + 2", label)
|
|
#else /* !CONFIG_HAVE_JUMP_LABEL_HACK */
|
|
#define ARCH_STATIC_BRANCH_ASM(key, label) \
|
|
"1: .byte " __stringify(BYTES_NOP5) "\n\t" \
|
|
JUMP_TABLE_ENTRY(key, label)
|
|
#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */
|
|
|
|
static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
|
|
{
|
|
asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]")
|
|
: : "i" (key), "i" (branch) : : l_yes);
|
|
|
|
return false;
|
|
l_yes:
|
|
return true;
|
|
}
|
|
|
|
static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
|
|
{
|
|
asm goto("1:"
|
|
"jmp %l[l_yes]\n\t"
|
|
JUMP_TABLE_ENTRY("%c0 + %c1", "%l[l_yes]")
|
|
: : "i" (key), "i" (branch) : : l_yes);
|
|
|
|
return false;
|
|
l_yes:
|
|
return true;
|
|
}
|
|
|
|
extern int arch_jump_entry_size(struct jump_entry *entry);
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#endif
|